Those are control characters of some type. That particular one is "Delete" - character \x7F. Assuming they are all the same, you can match against that. It might be better to match against a character class though, in case they vary.

The trick is to determine the ascii value of the character. Once you have that you can take its octal value and use ie \035 to match for it, where /s/035/the octal value of that character/. An entirely different approach, although far less likely to work is to simply use . which will match 1 character, regardless of what it is. Ofcourse this depends very heavily on whether the text you're trying to match has a specific order or not.